extragalactic hydrogen - green bank observatory · 2021. 4. 23. · extragalactic hydrogen...
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Extragalactic Hydrogen
Screenshot from first of 21,490 entries in the All Digital HI catalog in the Extragalactic Distance Database (https://edd.ifa.Hawaii.edu)
Cosmicflows: Helene Courtois et al.Cornell group: Martha Haynes, Riccardo Giovanelli ….
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HI observations with single dish radiotelescopes
Arecibo: 0 < δ < 38
GBT: δ > -45
Parkes: δ < -45
Sources smaller than beam:Exposure times to reach specified Signal/Noise:
t ~ D4
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HI observations with single dish radiotelescopes
Arecibo: 0 < δ < 38
GBT: δ > -45
Parkes: δ < -45
FAST: -14 < δ < 65 (-1 < δ < 52)
Sources smaller than beam:Exposure times to reach specified Signal/Noise:
t ~ D4
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Current sky coverage
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Luminosity – Linewidth Relation
Baryonic mass = gas mass + stellar mass
Distances for ~13,000 galaxies
H0 = 73.4 +-2.4 km/s/MpcEhsan Kourkchi et al. 2021
Tully & Fisher
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Galaxy flows Vpec = Vobs - H0 d
Numerical action orbit reconstructionsEd Shaya et al. 2021
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Large scale structure
Laniakea: Brent Tully et al. 2014
Dipole repeller: Yehuda Hoffman et al. 2018
Local Void: Brent Tully et al. 2019South Pole Wall: Daniel Pomarede et al. 2020
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Large scale structure